In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

“Can I come along with you on your fishing trip, please?” asked Millie. Her two elder brothers (1)________ at her scornfully. “Fishing is a man's (2) ________,” said her older brother, Derek. “Girls are not (3) ________ at fishing.” (4) ________ a while, however, Millie managed to persuade her brothers to take her (5) ________. When they reached the fishing pond, the two brothers wandered off by themselves.

Select the correct option to fill blank 3.

The correct option to fill blank 3 is good.

Explanation:
In the given sentence, "Girls are not (3) ________ at fishing," we need an adjective that appropriately describes skill or proficiency when paired with the preposition "at".
The expression "good at" is a standard English phrase used to express that someone possesses skill, talent, or ability in a specific activity (e.g., "good at fishing").

Let me evaluate the options:
• good: Correctly pairs with "at" to mean capable or skilled.
• sound: Means reliable, healthy, or logically valid; it does not take the preposition "at" to denote personal proficiency.
• likeable: Refers to a pleasant personality, not capability at an activity.
• acceptable: Means satisfactory or suitable, but does not fit the sentence structure describing personal skill.

Therefore, good is the most appropriate choice to complete blank 3.